fix: correct mkdocstrings import config for v2.0 compatibility

[czgdp1807]

Summary

This PR fixes the documentation build failure by correcting the mkdocstrings configuration in mkdocs.yml. The import key has been moved from the handler-specific options to the plugin root level, which is the correct location for mkdocstrings-python 2.0+.

Problem

The documentation build was failing with the following error:

TypeError: PythonConfig.__init__() got an unexpected keyword argument 'import'

This error occurred because the import configuration was incorrectly nested under handlers.python.import instead of being at the root mkdocstrings.import level.

Solution

Moved the import key from:

handlers:
  python:
    options:
      ...
    import:  # Wrong location
      - https://docs.python.org/3/objects.inv

To:

handlers:
  python:
    options:
      ...
import:  # Correct location
  - https://docs.python.org/3/objects.inv

Testing

• Documentation builds successfully with mkdocs build
• GitHub Actions workflow passes (refer - fix: correct mkdocstrings import config for v2.0 compatibility czgdp1807/ml-metadata#3)
• Local preview with mkdocs serve works correctly